jmcantrell/vim-virtualenv — pull request #33 by brianclements (2014-06-29 10:10:29+00:00)
Title: Set/clear $VIRTUAL_ENV on activate/deactivate

Set this so that other plugins that are configured to look for it
(Powerline) can now do that and behave accordingly.

Powerline was patched here:
https://github.com/Lokaltog/powerline/pull/896

To allow this functionality from it's end.

This patch also fixes #26.